The best replacement for siyah kernel is dorimanx.

The best alternatives to siyah kernel are rated as following:
★★★★★  dorimanx
★★★★  cm10
★★★  neak
★  boeffla
  perseus

Your alternative for siyah kernel is not listed? Suggest!
Speaking about siyah kernel, one probably shouldn't forget about cm9.

Other search terms related to siyah kernel and their ratings are:
★★★★★ cm9
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siyah kernel
dorimanx
cm10